Starting Over Problem

Hey, I am new to Pokemon Game development. I had downloaded all the tools required, and starting editing FireRed but sometimes this horrible bug comes in. Whenever I switch my Pokemon(on the field) the game starts over, that screen with Charizard shows up, it happens mostly when I am working with Advance Map. I have restarted editing many times(with fresh ROM file) but somehow this bug keeps showing up. Please help, it ruins all my efforts. :(

Also, if you could provide me links to latest tools available, that would be great.

Thanks.

I've moved your thread into the Launchpad because it sounds like it's related to ROM hacking, and Game Development is for anything except ROM hacks.

@mgriffin Okay thanks! I am new here. I didn't know where to post what.